Pressure-regulating valve



E. J. AUGUSHN. -PR E$SURE REGULATING VALVE- APPLICATION FILED me -1 920.

Patented 001;. 4,1921;

I f 2; l I fi' 7 4 3 O'M/W 15 frigerating apparatus for controlling. the

flow of the refrigerant from the high pres- UNITED STATES PATENT OFFICE.

EDWIN J. AUGUS TIN, OFv WAUWATOSA, WISCONSI-N, ASSIGNOR OF ON'E-'IHIIIRLD TO GEORGE BAUER AND ONE-THIRD T OTTO GRAY, BOTH, OF MILWAUKEE, WIS- CONSIN.

- sure-Regulating Valves; and I do hereby declarethat the following is a full, clear,

.and'sexact description thereof.

M 'nvention pertains partlcularlyv to new i and useful improvements in pressure regul'ating devices and has especial application tolexpansion valves for ratus.

:In the use of a device of this nature 1n rerefrigerating appasui'e side to'the low pressure side'of the apparatus, it is essential that the parts be so constructed as 'to eliminate a possibility of leakage; -Most'refrigerat ing apparatus expansi'on, valves are-automatically operated by means of a diaphragm, and as at present constructed s'uch diaphragms are perforated,

and thus there is a possibility of the refrigerant leakingfrom one side to theother thereof. The primary object of this invention, therefore, is to provide an expansion 'valve in which the'usual diaphraginis imperforate.

In devices of this character difliculty has also been experienced because of the cracking or breaking of the diaphragm due to excessive movement thereof. Consequently it is also the object of this invention to provide an arrangement whereby the parts of' the device may be actuatedby only slight movements of the diaphragm, and the bend-" ing of which is limited bysuitable stops.

Another object of the invention is to provide means for preventing the freezing of a part of the mechanism on one side of the diaphragm. I v Still another objectof the -invention're lates to the means for forming an improved -imperforate dia hragm for use iii-expansion valves for refrigerating apparatus. v I

-With these objects in view the invention resides in the novel features of construction and combination and arrangement of parts -.Which will be hereinafter more particularly described and claimed. 1

- Specification of Letters Patent.

The latter disk 7 Patented Oct. 4, 1921.

Applicationflled March 6, 1920. Serial No. 363,752.

In the accompanying drawing- F igure 1 represents a vertical sectional View through an expansion valve constructed in accordance with the invention.

Fig. 2 is atransverse sectional view taken on the plane of the line 2-2 of Fig. 1.

Referring more. particularly to this drawing, it will be seen that the main casing 1 of the device comprises an upper section 2 and a lower section 3,.the adjacent edges of which are flanged as at 4 and secured together by bolts 5. In crosssection each of the sections 2 and 3 is annular and the last mentioned section 3 is shouldered as at 6 tov provide a diaphragm seat in which the peripheral edge portion of a diaphragm disk 7 is disposed. When the two sections of the casing 1 are secured together by the bolts 5, this diaphragm disk 7 is clamped therebetween as clearly shown in Fig. 1.

In its present construction the diaphragm disk consists of a relatively thick plate of properly treated rubber or similar material having substantially equivalent properties; together with a metallic disk 7. is relatively thin and formed of flexible resilient sheet metal. Both of the disks and consequently the diaphragm are imperforate.

The upper end of the section 2 of the easwhich is disposed a longitudinal apertured plug 9. The inner end of the plug 9 is also counter-bored as at 10 to receive one end of ingl is provided with a threaded bore 8 in an. expan'sile coil spring 11 which surrounds the stem-12 of a pressure member, said member also including a disk-like head 13 mount ed on the. lower end of the stem 12 against which the opposite end of said spring 11 bears. The free end portion of the stem 12 extends into the threaded bore of the plug 9 which. forms a guide therefor. bore of the plug alsoreceives a threaded screw 14.

phragm- 7 is limited in its movements in The- From Fig. 1 it will. be noticed that the inner wall of the section 2 is provided with an annular-recess as" at 15 to receive the head 13. A shoulder 16 is also formed as this direction. Inasmuch asthe refrigerant used in-the apparatus of which this invention is adapted to low temperature, there is a tendency on the by the s'ection3 is the v is controlled by a 4 guide formed in a spider 22 The portion of the stem 21 that projects above the spider with. respect to the part of the ressure member including the stem 12 and ead 13 to freeze up to such an extent that responsive movement ofthe head diaphragm is Prevented. Therefore since the portion of'the casing 1 above the diaphragm 7 is fluid tight, I dispose a quantity of oil or other liquid 17 therein sufficient to cover the head 13.

Thelower portion of the casingl formed part through which therefrigerant passes, and is consequently provided with an inlet 18 and an outlet 19'.

he flow of refrigerant through the inlet 18 valve 20 mounted on the lower end of a stem 21, the intermediate por tion of saidstein being slidable through a I is screw threaded and disposed in the socket only slightly from diaphragm ofa stem 23 on which a diaphragm engaging 25 head 24 is mounted. An expansile spring 25 surrounds said stem 23 and respectively ,conditions the refrigerant flows through the moves the causes the in its upward movement and consequently v screened inlet 18 and the lower section 3 of the casing to the outlet 19, it being under stood that both inlet and outlet are connected with suitable piping to convey the refrlilgerant to desired parts of the apparatus. ow-v ever,'if the pressure of the refrigerant enter-*- 18 exceeds the pressure with ing the inlet which the spring 11 is holdin the valve 20 open, it acts against the diap ragm 7 and head 13 upwardly, the spring 25 head 24 to followthe diaphragm forin apart is at a very-'- erant from the coils of-the apparatus;

ing of the valve 20. f i.

be noted that the being designed to form closes the valve 20.. The flow oi refri rant 1S thus cut off until the pressure" t ereto drops to normal. It will be seen that regardless of the pressure of the refrigerant, the

diaphragm 7 can only move a limited extent due tothe en agement of the shoulder 16 by the head 13.; xcessive movement of the dia-: phragm and resultant cracking thereof is prevented, When it is necessaryto retain the valve,20 open for'an extended period of r time, for instance for removing the refrigscrew 14 is turned down un'tilatlforces the head 13 and diaphragm 7 downwardly to an extent to engage the stem 23 with the spider 22. movement of the diaphragm is also relatively slight owing to the stop provided by the spider-22,'but 1s suflicientto retain the valve 20 inopen position.

By utilizing a screen-for .the inlet 18, the scale is trappedin the'portion 18' and is thus prevented from entering the main portion of the casing to nterfere with the seat I claim: 1 Ina pressure regulatingfdevice, a casing, an imperforate diaphragm dividing the. casing into two compartments, an inlet and an outlet to one of the compartments, a spider extending across said compartment between the inlet and the} outlet and having a bore therethrough,.a valve stem reciprocable into said bore-and having a; valve at onelend adapted to seat on the outside of said inlet, a'head mounted on the other end of the valve stem andadjiisLtabl, longitudinally. thereof, said'he ad belng adapted to engage the diaphragm, I an expansile spring acting between the head and spider to into engagementwith thediaphragm and simultaneously urge said valveonto its-seat to-close said inlet, and means .on the other side of the diaphragm claim the urge the head for urging the dia v phragm and consequently the head and valve I 1 in the opposite direction. In testimonythat I foregoing I have hereunto set my hand at Milwaukee, in 1 the eountyof Milwaukee and State of Wisconsin. a

' Enwni JQAUGUSTIN. 

